Population Health Interventions: Integrating Individual and Group Level Evidence (R21)- Clinical Trials Not Allowed | PA 18 406

Opportunity Information: Apply for PA 18 406

The National Institutes of Health (NIH) funding opportunity titled "Population Health Interventions: Integrating Individual and Group Level Evidence (R21) - Clinical Trials Not Allowed" (Funding Opportunity Number PA 18-406) is a discretionary grant program designed to push health research beyond the traditional focus on biology and individual clinical care and into real-world, population-level change. The central idea is that lasting improvements in health outcomes and reductions in disease burden often depend on interventions that address the broader conditions shaping health, such as social, economic, and environmental drivers. This announcement supports research projects that are multilevel and transdisciplinary, meaning applicants are expected to bring together expertise from multiple fields and design interventions that operate across more than one layer of influence (for example, individual behavior combined with community systems, policy, institutional practices, or neighborhood environments). The emphasis is on using evidence from both the individual level and the group or community level and integrating that evidence into practical interventions that can improve outcomes at scale.

This FOA uses the NIH R21 mechanism, which is typically intended for exploratory, early-stage, or proof-of-concept research. In practice, that means the program is well-suited to innovative ideas that may still be developing but have a strong rationale and a clear plan for generating useful knowledge. The award ceiling listed for this opportunity is $200,000, indicating that awards are capped at that level under the opportunity as described. While the source data does not list the number of expected awards, the intent of the mechanism suggests NIH is looking for a portfolio of creative, high-impact intervention concepts that can help establish new approaches or produce preliminary data to support later, larger-scale projects.

A key restriction is captured directly in the title: clinical trials are not allowed. In general terms, applicants need to ensure their proposed work does not meet NIH's definition of a clinical trial, which typically involves prospectively assigning human participants to one or more interventions to evaluate effects on health-related biomedical or behavioral outcomes. This does not mean the research cannot involve people or communities, but it does mean the design must stay on the non-clinical-trial side of NIH rules for this specific announcement. Applicants usually handle this by focusing on intervention development, implementation research that does not prospectively assign individuals, natural experiments, observational or quasi-experimental approaches, policy evaluations, systems-level changes assessed with existing data, or other designs that evaluate population health interventions without fitting the clinical trial definition. The practical takeaway is that proposal design and classification matters here, and applicants should align methods to the "clinical trials not allowed" boundary.

The program’s thematic focus is on interventions that target root causes and upstream determinants rather than only downstream outcomes. That includes, for example, improving health by addressing housing stability, food access, transportation systems, education-related conditions, environmental exposures, employment and economic opportunity, neighborhood safety, structural barriers, or other contextual factors that strongly shape population health patterns. NIH is signaling that interventions should be built to work across levels, so proposals that link individual-level evidence (like risk factors, behaviors, or service use) with group-level evidence (like community conditions, institutional practices, or policy environments) are particularly aligned. The most responsive projects will likely articulate a clear theory of change connecting upstream conditions to measurable health outcomes and will justify why a multilevel strategy is necessary rather than optional.

Eligibility for this opportunity is broad and intentionally inclusive, spanning government, academic, nonprofit, and private-sector organizations. Eligible applicants include state governments, county governments, and city or township governments, along with special district governments. Educational entities are eligible as well, including independent school districts and both public/state-controlled and private institutions of higher education. Tribal eligibility includes Native American tribal governments that are federally recognized as well as Native American tribal organizations other than federally recognized tribal governments, reflecting NIH interest in supporting work in tribal contexts and with tribal-serving entities. Housing-related public entities such as public housing authorities and Indian housing authorities are also eligible, which fits the population health framing that considers housing as a major driver of health.

The FOA also explicitly recognizes a range of additional eligible applicants, including Alaska Native and Native Hawaiian Serving Institutions; Asian American, Native American, and Pacific Islander Serving Institutions (AANAPISISs); Hispanic-serving institutions; Historically Black Colleges and Universities (HBCUs); and Tribally Controlled Colleges and Universities (TCCUs). Faith-based and community-based organizations are included, which is important because these groups often have the trust, reach, and on-the-ground insight needed to implement and evaluate population health interventions. The listing also includes eligible federal agencies, regional organizations, U.S. territories or possessions, and even non-domestic (non-U.S.) entities (foreign organizations). This breadth suggests NIH is open to strong intervention ideas wherever the relevant expertise and partnership capacity exist, including cross-regional or international perspectives when appropriate.

The opportunity is categorized under the funding activity areas of education and health, and it is associated with CFDA numbers 93.121, 93.173, and 93.399, which correspond to NIH program areas and help indicate where the funding is administered within federal assistance listings. The original closing date in the provided data is May 7, 2019, and the opportunity creation date is November 21, 2017. That timing matters because it indicates the announcement as provided is historical; applicants interested today would typically need to check NIH for a reissued FOA, active due dates, or successor announcements covering a similar scientific aim.

Overall, this grant opportunity is about developing and studying population health interventions that are grounded in real conditions shaping health and that deliberately connect what is known about individuals with what is known about communities and systems. It invites teams that can work across disciplines and sectors, translate evidence into practical intervention strategies, and produce actionable findings that can ultimately improve health outcomes at a broader scale, while staying within the non-clinical-trial constraints of the announcement.

• The National Institutes of Health in the education, health sector is offering a public funding opportunity titled "Population Health Interventions: Integrating Individual and Group Level Evidence (R21)- Clinical Trials Not Allowed" and is now available to receive applicants.
• Interested and eligible applicants and submit their applications by referencing the CFDA number(s): 93.121, 93.173, 93.399.
• This funding opportunity was created on 2017-11-21.
• Applicants must submit their applications by 2019-05-07. (Agency may still review applications by suitable applicants for the remaining/unused allocated funding in 2026.)
• Each selected applicant is eligible to receive up to $200,000.00 in funding.
• Eligible applicants include: State governments, County governments, City or township governments, Special district governments, Independent school districts, Public and State controlled institutions of higher education, Native American tribal governments (Federally recognized), Public housing authorities/Indian housing authorities, Native American tribal organizations (other than Federally recognized tribal governments), Nonprofits having a 501 (c) (3) status with the IRS, other than institutions of higher education, Nonprofits that do not have a 501 (c) (3) status with the IRS, other than institutions of higher education, Private institutions of higher education, For-profit organizations other than small businesses, Small businesses, Others.

Apply for PA 18 406

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